Quantifying Static and Dynamic Stability in Amputees with Low Activity

Background: Approximately 67% of lower limb amputees fall once or more every year. It is important for their daily functioning and their social life that their prosthetic device provide them with stability and security. Measuring stability for amputees and their prosthetic devices is challenging, es...

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Main Author: Theodórsson, Snorri Rafn
Format: Bachelor Thesis
Language:English
Published: KTH, Skolan för kemi, bioteknologi och hälsa (CBH) 2019
Subjects:
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264404
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spelling ftkthstockholm:oai:DiVA.org:kth-264404 2023-05-15T16:49:37+02:00 Quantifying Static and Dynamic Stability in Amputees with Low Activity Kvantifiering av statisk och dynamisk stabilitet i amputerade med låg aktivitet Theodórsson, Snorri Rafn 2019 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264404 eng eng KTH, Skolan för kemi, bioteknologi och hälsa (CBH) TRITA-CBH-GRU 2019:105 http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264404 info:eu-repo/semantics/openAccess Medical Engineering Medicinteknik Student thesis info:eu-repo/semantics/bachelorThesis text 2019 ftkthstockholm 2022-08-11T12:39:44Z Background: Approximately 67% of lower limb amputees fall once or more every year. It is important for their daily functioning and their social life that their prosthetic device provide them with stability and security. Measuring stability for amputees and their prosthetic devices is challenging, especially for amputees with low activity level. However, it is important for the users and the product designers to know if the products are actually providing the user with more stability. Objective: The aim of the study is to create a measurement protocol to quantify static and dynamic stability with enough sensitivity to differentiate between two prosthetic products for amputees with low activity level. Methods: Ten K2, unilateral transtibial subjects were recruited and 6 of them completed the protocol during a 2-hour visit. They repeated the same protocol for two prosthetic feet, K2C (Össur, Iceland) and K2 Sensation (Össur, Iceland). In order to compare the static and dynamic stability of the subjects and the products, three different tests and one questionnaire were used: Static standing test, Limit of Stability (LOS) test, Walking on level ground, and the Activities-specific Balance Confidence scale (ABC scale). Results: For the static standing test, the K2Sensation showed less range for the center of pressure in the anteroposterior direction while standing in a normal position with the eyes open. However, the participants were able to reach further (LOS test) over their prosthetic side while wearing the K2C foot. For the K2C foot, gait parameters such as ankle power, positive work, self selected walking speed and the range of motion in the prosthetic ankle all increased. The backward margin of stability (BwMOS) only increased for 2 participants who had it in common to both wear ProFlex-XC in daily life. No difference was seen in perceived stability according to the ABC scale. Conclusion: The aim of the study was reached. Static and dynamic stability were quantified and distinguished between the 2 different ... Bachelor Thesis Iceland Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA
institution Open Polar
collection Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA
op_collection_id ftkthstockholm
language English
topic Medical Engineering
Medicinteknik
spellingShingle Medical Engineering
Medicinteknik
Theodórsson, Snorri Rafn
Quantifying Static and Dynamic Stability in Amputees with Low Activity
topic_facet Medical Engineering
Medicinteknik
description Background: Approximately 67% of lower limb amputees fall once or more every year. It is important for their daily functioning and their social life that their prosthetic device provide them with stability and security. Measuring stability for amputees and their prosthetic devices is challenging, especially for amputees with low activity level. However, it is important for the users and the product designers to know if the products are actually providing the user with more stability. Objective: The aim of the study is to create a measurement protocol to quantify static and dynamic stability with enough sensitivity to differentiate between two prosthetic products for amputees with low activity level. Methods: Ten K2, unilateral transtibial subjects were recruited and 6 of them completed the protocol during a 2-hour visit. They repeated the same protocol for two prosthetic feet, K2C (Össur, Iceland) and K2 Sensation (Össur, Iceland). In order to compare the static and dynamic stability of the subjects and the products, three different tests and one questionnaire were used: Static standing test, Limit of Stability (LOS) test, Walking on level ground, and the Activities-specific Balance Confidence scale (ABC scale). Results: For the static standing test, the K2Sensation showed less range for the center of pressure in the anteroposterior direction while standing in a normal position with the eyes open. However, the participants were able to reach further (LOS test) over their prosthetic side while wearing the K2C foot. For the K2C foot, gait parameters such as ankle power, positive work, self selected walking speed and the range of motion in the prosthetic ankle all increased. The backward margin of stability (BwMOS) only increased for 2 participants who had it in common to both wear ProFlex-XC in daily life. No difference was seen in perceived stability according to the ABC scale. Conclusion: The aim of the study was reached. Static and dynamic stability were quantified and distinguished between the 2 different ...
format Bachelor Thesis
author Theodórsson, Snorri Rafn
author_facet Theodórsson, Snorri Rafn
author_sort Theodórsson, Snorri Rafn
title Quantifying Static and Dynamic Stability in Amputees with Low Activity
title_short Quantifying Static and Dynamic Stability in Amputees with Low Activity
title_full Quantifying Static and Dynamic Stability in Amputees with Low Activity
title_fullStr Quantifying Static and Dynamic Stability in Amputees with Low Activity
title_full_unstemmed Quantifying Static and Dynamic Stability in Amputees with Low Activity
title_sort quantifying static and dynamic stability in amputees with low activity
publisher KTH, Skolan för kemi, bioteknologi och hälsa (CBH)
publishDate 2019
url http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264404
genre Iceland
genre_facet Iceland
op_relation TRITA-CBH-GRU
2019:105
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264404
op_rights info:eu-repo/semantics/openAccess
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